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Platinum Metals Rev., 2002, 46, (1), 43

NEW PATENTS: January 2002

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METALS AND ALLOYS

Hydrogen Permeation Alloy

ishifuku kinzoku kogyo kk Japanese Appl. 2001/131, 653

An alloy for a H2 permeation film for the purification and separation of H2 comprises 3-15 at.% Tb, Dy, Ho or Er of the rare earth elements, and balance of Pd and impurities. The alloy has a high H2 permeability, compared to conventional membranes.

Palladium Based Alloy

guiyan platttnum ind co ltd Chinese Appl. 1, 301, 875

A Pd based alloy (1) used as a contact material contains (in wt.%): 30-85 Pd, 14-70 Cu and 0.0.5-1 La, Ce, Sm or Gd. A Pd based composite contactor is prepared by compounding (1) wifh a Cu based alloy material, which comprises (in wt%): 84-98.4 Cu, 0.5-5 Fe, 1-10 Ag and 0.1-10 rare earth selected from La, Ce, Sm or Gd. (1) may be made into wire, or contacts of pure or composite alloy.

ELECTROCHEMISTRY

Platinum/Iridium Electrode FiIm for Electrolysis

shunko pantec co ltd Japanese Appl. 2001/073, 178

An electrode film contacted to a Solid polymer electrolyte (SPE) film is made using magnetron sputtering. The apparatus has an Lr cathode and a SPE anode. Voltage is impressed orthogonal to the magnetic field, which is parallel to the cathode, forming an Ir oxide layer on the anode. A Pt layer is formed on top. The electrode tUm has good adhesion and permits prolonged electrolysis irrespective of the electrolysis temperature.

Photocatalyst for Decomposition of Water

postech found Korean Appl. 2001/025,812

A photocatalyst (1) for decomposing H2O to H2 and O2 under ambient temperature and pressure has the formuk, AnBnO3n+2, where A is Ca or La, B is Nb and Ti, and n is 4 or 5. The decomposition occurs using a self-sacrifice organic alcohol. (1) is impregnated with 0.1-5 wt.% of Pt, Ni, Cs or Bi. (1) is reduced at 300-800°C and oxidised at 200-500°C.

ELECTRODEPOSITION AND SURFACE COATINGS

Aluminide Coating for Turbines

united technologies corp EumpeanAppl. 1, 111, 091

The corrosion and oxidation resistance of MCrAl overlay coating, for turbine engines, is improved by adding one O-active element, such as Y, Hf and Si, to the coating for the superalloy substrate. A Group VIII metal such as Pt, is then applied to the overlay and the coating is aluminised by CVD and heat treated. A ceramic thermal barrier may be applied. The durability of the overlay coating is increased.

Platinum Electrolyte for Electroplating Gas Turbines

honeywell int inc World Appl. 01/51,688

An electrolyte, for electroplating gas turbine blades and vanes with Pt, comprises 0.01-320 g L-1 of Pt as Pt(NH3)2(NO2)2 and 0.1-240 g Γ1 of M2CO3 or MHCO3, where M is selected from Li, Na, K, Rb or Cs. The electrolyte reduces the production of Cl, S or P contaminants. A highly stable electrolytic ultra-pure Pt plating on superalloys is obtained. No insoluble Pt compounds are formed during plating or storage.

Electroplating Using Magnetic Field

s. y. choi et al. Karean Appl. 2001/010,788

A magnetic field generator is added to a plating vessel to produce uniform plated Pt, Ru or Cu on a large scale Si substrate. The magnetic field controls the directions and densities of the flowing metal ions of the electrolyte. well distributed Pt, Ru and Cu layers are obtained by combining a permanent magnet and an electromagnet in the plating vessel. An ultrasonic oscillator is attached to the cathode.

APPARATUS AND TECHNIQUE

Soot Sensor Used in Internal Combustion Engines

heraeus electro-nite int nv European Appl. 1, 106, 996

In a soot sensor used in ICEs part of the exhaust gas carrying particles of soot passes through a ceramic meander-type moulded substance (1) with open pores in the direction of the current. A thin-film Pt resistor temperature probe in the soot sensor measures the temperature of the substance. After reaching the ignition temperature of the soot on (1), the temperature is kept isothermal by recyding the heat, which is evaluated to measure the amount of soot fhat flowed past.

Hydrogen Gas Sensor

matsushita denki sangyo kk JapaneseAppL 2001/033, 425

A sensor for detecting H2 gas has a pair of Pt electrodes adhered to a porous ceramic layer carrying a H2 oxidising catalyst and O ion electroconductive Solid electrolyte layer placed sequentially on a heater. The test gas is made to flow in the catalyst area of the sensor. The ceramic substance has a controUable mean pore diameter of ∼ 100 Å, which prevents poisoning. The sensor is durable and highly reliable.

Oxygen Sensor

ngk spark plug co ltd Japanese Appl. 2001/074, 688

An O2 sensor has leads of ∼ 10 μm thickness passing through a support. The leads are made of an electrically conductive material and Pt is the principal component. The sensor can detect the O2 concentration in waste gas from the ICE of vehicles and the Combustion parts ofboilers. Operation of the sensor is improved by reduced electrical resistance of the leads.

Constant Electrical Resistance Alloy

denki jiki zairyo kenkyusho JapaneseAppl. 2001/107, 160

A constant electrical resistance alloy for an eddy current-type sensor contains in wt.%): 37-47 Ag; remainder of Pd; and 7 Mn, Ta, W, Fe, Co and/or Ni; ≤ 5 Re, Os, Ru and/or Rh; ≤ 3 Mo, Nb, In, V, Ge, Ti, Zr, Hf, Cr and/or TI; ≤ 2 Be, Ga, AL Si Sn and/or Sb; ≤ 0.5 C, B and/or P; ≤ 1 Bi, Zn and/or Cd; or 0.001-10 rare earth elements. The alloy has high tensisle strength and a temperature coefficient of electrical resistance at 0-600°C of 100 × 10-6 to -100 × 10-6/°C It can be used under high temperature and high pressure conditions.

Oxygen Sensor and Manufacturing Method

ngk spark plug co ltd Japanese Appl. 2001 /124, 726

An O2 detection electrode (1) for use in ICE is produced by heat processing a Pt electrode, which is doped wifh a single metal from Groups IB, IIB, ΙΠΒ, IVB, VB and VIB, at 900-1500°C. The Pt electrode is attached to one surface of a Solid electrolysed body that has O ionic conductivity. Doping improves the low temperature control of (1), so stable operation is achieved under high temperature conditions.

Ozone Weather Meter

suga shikenki kk JapaneseAppl. 2001/133, 388

An ozone generator (1) for a weather meter comprises a ceramic dielectric plate with all, Pt, Ir or Rh deposited on its upper surface, and also a discharge electrode film covered by a glass membrane. An earth electrode, thermoelectric refrigeration element and cooUng plate are arranged on the under surface. The generator has an O2 scraper kuncher and an ozone gas receptacle. (1) is small in size and stable generation of ozone is obtained without mixing impurities.

Nitrogen Oxide Detector

valtion teknejjnen tutkmuskeskus JapaneseAppL 2001/149, 758

NOx is detected in waste gas exhausts by contact wifh a catalyst of Pd, Rh and/or their oxides supported on zeoUte. The fuel, suppUed under rich/lean periodic conditions, is bumt and the waste gas formed contacts the catalyst. NOx in the waste gas is detected at the contacted part. The fuel can be burnt at a high reaction temperature in the presence of O2 and SOx. The method is highly reliable.

HETEROGENEOUS CATALYSIS

Cyclododecanone and Cyclododecanol

ub ind ltd European Appl. 1, 090, 900

Cyclododecanone (1) and cyclododecanol (2) are produced in high yields, by reacting an epoxycy-clododecane compound with H2 in the presence of a Solid catalyst containing Pt group metal,(s), a promoter of at least one from Groups VIII, IIB,IIIB,IVB,VB,VIB or VIIB or knthanide, and a carrier. (1) and (2) are intermediates for synthetic resins and fibres.

Pure Halogenated Benzyl Alcohol

clarlant gmbh European Appl. 1, 101, 752

Pure fluorinated or chlorinated benzyl alcohol derivatives are prepared in high yield and purity by reacting a corresponding benzaldehyde with H2 at 0-120°C over a catalyst, optionally in the presence of a solvent. The catalyst contains Pd or Pt supported on active C, Al2O3, SiO2, etc. Almost no formation of dehalogenated byproducts is obtained (despite the use ofhighly active hydrogenation catalysts).

Oxacylation Catalyst

dalren chem corp European AppL 1, 112, 775

An oxacylation catalyst (1), for allyl acetate production, comprises a main Pd Catalyst, Sn or a mixture of Sn and other metal,(s) as the promoter, and alkali or alkaline earth compound (2) supported on the outer surface of a porous carrier. (1) is prepared by impregnating a porous carrier wifh a solution containing Pd and promoter metal,(s) in an oxidative state, followed by reduction of the metal,(s) and final impregnation wifh (2). The catalytic activity and life of (1) is retained, with high selectivity.

Hydrogenation of Dicarboxylic Acids

tonen chem corp European AppL 1, 112, 776

A catalyst (1) for the hydrogenation of dicarboxylic acids comprises Pd and Re supported on an active C. carrier, obtained from coal, coconut or peat. Random points on the catalyst are analysed by EPMA; in terms of Re, ≤ 20% of analysed points have an intensity ratio of ≥ 2. (1) has very high capability for hydrogenating dicarboxyUc acids and a high selectivity to lactones and to products hydrogenated further, even at low hydrogenation pressures.

Diesel exhaust Catalytic Converter

dmc2 degussa metals catalysts cerdec ag European Appl. 1, 129, 764

A long-life automotive diesel engine catalyst (1) comprises a zelite with Al oxide or Silicate, and Si, Ti or Zr dioxide, and 0.05-10 wt.% Pt, Pd, Rh or Ir, w.r.t. the overall weight of the catalyst. The Pt group metal has a mean oxidation number of < +2.5, wifh > 3 metal- and < 3 O-Ugands. Pt group metal crystallites (1^5 nm) are present on the surface of the zeoUte and substrate oxides. (1) has high oxidation activity fot CO and hydrocarbons at 120-170°C.

Hydrogenating Highly Unsaturated Hydrocarbons

philips petroleum co World Appl. 01/19, 763

A catalyst for hydrogenating highly unsaturated hydrocarbons, such as allcynes and diolefins, to lower unsaturated hydrocarbons, such as ethylene, propylene, etc., comprises Pd, a metal aluminate catalyst support and a Ag or alkali metal catalyst compound. The Al2O3 (at least two forms) support is impregnated with a melted metal component, dried and calcinated at 600-1350°C. The Pd has a better surface distribution, and no physical mixing and coprecipitation is needed. The process gives increased selectivity.

Removal of Organic Compounds from Waste Gas

general electric co World Appl. Ol /37, 976

A process for removing organic compounds from industrial waste gas, such as MeOH and cumene, byproducts from phenol manufacture, is claimed. Waste gas, maintained at 120—160°C, is passed through a guard bed in the presence of O2, and then through a 0.1—3 wt% Pd/activated Al oxide catalyst bed. Voktik organic chemicals are removed from the waste gas stream while avoiding catalyst deactivation due to phenol tar formation. Highly destructive industrial waste gas, containing harmful substances, can be efficiently removed and purified.

Catalytic Converter for exhaust Gas

cataler corp U.S. Patent 6,261, 989

A catalytic converter for exhaust gas comprises a heat resistant support with a catalytic coating containing Pd-carrying particles of a Ce complex oxide, Pt- and Rh-carrying particles of Zr complex oxide, and particles of a heat resistant inorganic oxide. At least one sulfate is present to prevent Pd poisoning. The converter maintains high catalytic activity even at high temperature while also providing effective catalytic activity before the engine is sufficiently warmed up at the relatively low temperature of 200-400°C.

Removal of Nitrogen Oxide from Road Tunnels

kanai shwi gijutsu kenkyusho kk Japanese Appl. 2001/046, 866

NOx removal material for use in road tunnels, contains Ti, Zr, Al, Cr, Co, Zn, Ni, In or La and manganate-doped Ru, Rh, Pd or all. NOx in air, in tunnels, underground passenger transport, indoor or outdoor parking places, etc., is effectively absorbed and removed. Large amounts of NOx can be dealt with, even in low concentrations.

Exhaust Purification Catalyst

nissan motor co ltd Japanese Appl. 2001 /046, 870

A catalyst for the purification of exhaust gas ejected from an ICE, comprises a mixture of Pt and a W group complex oxide coated on a support. The mixture is heat-treated at 30O-700°C for > 1 hour, under an oxidising atmosphere containing O2. The 4f bond energy ofPt is set to 70.8-71.2 eV according to XPS. Hydrocarbons, CO and NOx present in the exhaust gas are effectively removed. The durability and purification abnity of the catalyst are improved.

Catalyst for Nitrogen Oxide Decomposition

Mitsubishi jukogyo kk Japanese Appl. 2001/0.58, 130

A high activity catalyst for decomposing NO in waste gas, such as Combustion exhaust gas, comprises Pt, Pd, Rh, Ag and/or all impregnated in a Ce group (1) Solid electrolyte. (1) is (CeO2)1-X(BaO)x (Ce02)1-x (Y2)O3)x(ceo2)1-x(G2O3)x(ceo2)1-x(CaO)x(Ce02)1-x(SM2O3)xand /or (BaO)y (ce02)1-x-y)(Gd2O3)xwhere x = 0-0.6, y = 0.4-.6 and x +y < 1. NO is decomposed effectively to N2 and O2 and the catalyst is little affected by any coexisting H2O and SO2.

Purification of exhaust Gas from ICE

daihatsu motor co ltd Japanese Appl. 2001 /062, 295

Catalysts for purifying exhaust gas consist of a heat resistant support and a single-kyet coat (1) formed on the heat resistant support (1) comprises a Ce-type compound oxide loaded wifh Pt and Rh, and a Zr-type compound oxide loaded wifh Pt and Rh. The catalysts purify NOx, CO and hydrocarbons from exhaust gas emitted from ICEs. The catalysts retain high catalytic activity even after exposure to high temperatures.

Hydrogenation Process for Hydrogenates

tanaka mkdjzoku kogyo kk Japanese Appl. 2001/081, 477

A hydrogenation reaction for obtaining a hydrogenate from a pyridine uses a Pd/C catalyst. The product is obtained by reacting pyridine solvent in the presence of the Pd/C. It is desirable that the hydrogenate is a closed-ring structure secondary amine obtained by the hydrogenation of a pyridine. The catalytic activity of Pd/C is improved effectively and its durabtfity is enhanced; the yiekl of hydrogenated product is improved.

Nitrogen Oxide Removal Material

kanai shdj gijutsu kenkyusho kk Japanese Appl. 2001/104, 781

A catalyst and method for the selective oxidative decomposition of NH3, amines and NOx is described. The catalyst contains a manganate doped with at least one kind of metal or metal ion selected from Pt, Pd, Rh, Ru, Ir, all, Ag, Ti, Zr, AL V, Mo, etc. Catalytic reduction of NH3 or amines contained in industrial waste gas and waste H2O can be carried out selectively at low temperature.

Purification of Waste Gases

Osaka gas co ltd Japanese Appl. 2001/104, 792

A waste gas purification catalyst contains Pt or Ru fixed on a Zr sulfate support. NOx is decomposed in the presence of CH4 as a reducer and an excess of O2 and the purification can be carried out effectively for a long period. A high conversion ratio for CH4 is maintained, thus the residual CH4 concentration in the process gas is lowered. The catalyst has stable activity for a long time, due to the presence of CH4 reducer, and is maintained even when SOx is present

Purification of exhaust Gas

Nissan motor co ltd Japanese Appl. 2001/129, 403

A catalyst for the purification of exhaust gases ejected from a motor vehicle has two or more layers containing a Pt group metal selected from Pt, Pd or Rh, CeO2 and alkaline earth oxide. The weight ratios for the Pt group metal CeO2 and alladine earth oxide in the inner and surface layers of the catalyst are 10:19-40:60, 99:1-50:50 and 1:99-50:50, respectively. The catalyst has high low-temperature activity and high rate of purification. The removal ofhydrocarbon, CO and NOx in the exhaust gas is efficient.

HOMOGENEOUS CATALYSIS

Chiral Amine Preparation

aventis res & technologies gmbh & co kg European Appl. 1, 103, 536

Chiral amines (intermediates for pharmaCellticals, agrochemicals, etc.) are prepared by asymmetric hydrogenation of electron-rich enamines by reaction wifh H2 in presence of a chiral catalyst. The catalyst is a metal-ligand complex consisting of at least one Group VlII metal such as Rh or Ir, and at least one specific mono- or bidentate phosphine or diphosphine Ugand. The enamines are hydrogenated efficiently under mUd conditions to give chiral amines in good yields and high enantiomeric selectivity.

Decahydronaphthalene Dicarboxylic Acid

mitsubishi gas chem co inc Japanese Appl. 2001/031, 622

Decahydronaphthalene dicarboxyUc acid, for use as a polyester modifier, is produced in high yield by hydrogenating naphthalene dicarboxyUc acid in the presence of a Ru and/or a Pt based catalyst, in an inert solvent, such as an alcohol, ether, lower fatty acid, etc. The reaction proceeds at ≤ 15 MPa and 40—150°C. The trans isomer is obtained at high selectivity. The naphthalene dicatboxyUc acid is preferably diluted wifh solvent to a concentration of 5^30 wt.%.

Trimethylolalkane Monoalkyl Ethers

kao corp Japanese Appl. 2001 /072, 635

Trimethylolalltane monoallcyl ethers, used as non-ionic surfactants, are prepared wifh high selectivity by reacting a trimethylol derivative wifh a conjugated diene in the presence of a Pd compound and a tertiary phosphine or phosphite, or a Pd tertiary phosphine or phosphite complex, to give an efher wifh an allcadienyl group. The alkadienyl group is hydrogenated under H2 using a Group VIII catalyst, then hydrolysed in the ptesence of an acid catalyst.

Methacrylic Acid Purification

mitsubishi rayon co ltd Japanese Appl. 2001/072, 643

MethacryUc acid, manufactured from methacrolein and MeOH by Hquid phase reaction using a Pd containing compound, is purified by contact with a compound containing: a primary and/or secondary amino group, a mercapto group, or sulfonic acid group. Pure methacrylic acid with reduced colouring ability and excellent polymerisation ability is obtained in high yield.

Production of lminodicarboxylic Acids

skw trostberg ag GermanAppl. 1/99/54, 194

IminodicarboxyUc acids are produced by amidocarbonylation with CO, in an acid environment, using a Pd catalyst, such as Pd acetate or Pd chloride, and an aldehyde, with hydrolytic cleavage of the JV-acyl group in aqueous medium. The catalytic system contains HBr or HC1. The process does not require high temperature and pressure, or anhydrous conditions.

FUEL CellS

Fuel Cell Gas Diffusion Electrode

Johnson matthey plc European Appl. 1, 096, 586

A gas-liquid permeable porous electrode comprises a non-uniform electrode layer supported on an electron conducting material or a proton conducting Solid polymer membrane film. The layer contains an electrocatalyst (1) with concentration varying across the electrode in a pattem which coincides with the path of the gas field flow. (1) is applied to the electrode by screen printing, etc. (1) is a metal oxide, supported metal or metal oxide, such as a Pt group metal all or Ag, or their alloys. Electrode composition and structure is specifically tailored to match operational requirements of the fuel Cell for optimum performance and efficient materials use.

Hydrogen Generation Device

matsushita electric ind co ltd World Appl.. 01/47, 802

A H2 generating device contains a reformer with a reforming catalyst, a raw material supply part, a H2O supply, a heater, a modifying Pt group metal and a metal oxide catalyst, and a purifying catalyst for the oxidation or methanation of CO. H2 for cogeneration systems and/or fuel Cells is produced. The generator operates safely for long periods on repeat starting and stopping. The standing time of the device is reduced.

Catalyst for Fuel Cell Batteries

idemitsu kosan co ltd WorLd AppL 01 /64, 337

A catalyst for removing CO from H2-containing gas in fuel Cell batteries, comprises Ru, such as Ru nitrate, on a flame-resistant inorganic oxide carrier, such as Al2O3 and Al2O3-TiO2. The catalyst is dried and then reduced without burning. The Al2O3 has a maximum value for distribution of fine pores pore radius ≤ 100 Å). The catalyst has significantly improved activity.

Alloy for Hydrogen Permeation Films

lshifuku kinzoku kogyo kk Japanese Appl. 2001/046, 845

An alloy for H2 permeation films used for the purification and isolation of H2 for fuel Cells, comprises 3—15 at.% of Sm, Ce and Yb, and remainder Pd. The H2 permeation alloy film allows permeation of H2 at high rate. No intermetallic compound such as Pd5Sm is produced so that excellent H2 permeation capacity is assured. H2 can be obtained at a high temperature.

Carbon Monoxide Removal from Hydrogen Gas

nissan motor co ltd Japanese Appl. 2001 /089, 101

Selective removal of CO from H2 gas involves contacting H2 with a gas mixture containing O2 over a catalyst having Ru on a support containing Ce. CO concentration is efficiently reduced within a temperature range where the side reactions such as methanation are suppressed. The process is used to remove CO ftom the H2 obtained by modifying MeOH suppUed to the fuel electrode of a fuel Cell.

High Activity Electrode for Fuel Cells

japan storage battery co ltd Japanese Appl. 2001/118, 580

An electrode for fuel Cells contains a cation exchange resin, C. parricles and Pt. The quantity of H2 desorbed at 50-150 mV/RHE is ≥ 60% of the H2 desorbed at 5C-400 mV/RHE, measured by cyclic voltammetry. The electrode has a high activity and its performance with respect to reduction reaction of O2 is improved.

Methanol Reforming Catalyst for Fuel Cells

nissan motor co ltd German Appl. 1 /00/62, 578

A MeOH reforming catalyst useful for producing H2 for fuel Cells comprises a metal oxide support impregnated wifh a Pd-Zn alloy. The catalyst contains at least one component selected from Pd-Zn-Ce, Pd-Zn-Zr and Pd-Zn-Ce-Zr based compounds. The catalyst is used in the gas phase reaction of MeOH wifh steam and O2 to produce a H2-containing gas as an energy source for a vehicle. The catalyst has high activity, good stability in a hot oxidising atmosphere and low CO production.

ELECTRICAL AND ELECTRONIC ENGINEERING

Dielectric Element for Ferroelectric Memory

sanyo electric co ltd European Appl. 1, 102, 329

A dielectric element (1), for a capacitor, has an insulator film with an oxide based dielectric film (2) and an electrode including a first conductor film containing at least Ir, Pt, Ru, Re, Ni, Co or Mo1 and Si. (1) is used in ferroelectric memory and DRAM. O2 is inhibited from diffusing along the grain boundaries during heat treatment of (2) so oxidation and deterioration of memory characteristics are suppressed.

metal, Oxide Deposition for Capacitor

applied materials inc WorMAppl.O/SQ, S�

A capacitor comprises a metal oxide layer deposited on a substrate (by CVD at 480°C) followed by annealing at 600-900°C for a time of 0.1 s to 30 min, then at 50C^600°C for 5 min. A 3D cup-type capacitor comprising a Pt bottom electrode, a BaSr titanate dielectric layer, and a Pt top electrode is claimed. The capacitor has reduced current leakage (≤ 10 fA/Cell) and is used in DRAM for data storage. The deposited oxide layer/film has uniform composition and a high degree of crystallinity, giving higher capacitance.

Thin FiIm Magnetic Disk

x. blw et al. U.S. Appl 2001 /0, 018, 136

A thin film magnetic disk comprises: a substrate; a pre-seed layer with an amorphous or nanocrystalline structure; a non-magnetic RuAl seed layer; non-magnetic underlayer(s); onset layer(s); and magnetic layer(s). The latter comprises an alloy of CoPt*CrB^, where (in at.%) x > 4 +y. The disk is used for data storage devices. The pre-seed layer improves grain size and thermal conductivity.

Magnetic Transducer Element

headway technologies inc U.S. Patent 6, 239, 948

A magnetic transducer element comprises a nonmagnetic conductor layer made from an alloy of Ni and a non-magnetic conductor metal,(s) of (in wt.%): 45-90 Cu, 20-75 Zn, 35^5 Cd, 55-90 Pt, and/or 75—95 Pd. The transducer element is used in magnetic read heads, inductive magnetic write heads, inductive magnetic read-write heads, etc., and for a magnetic data storage enclosure. It has enhanced reUability.

Capacitor for Memory CeII

s. j. deboer and r. p. s. thakur U.S. Patent 6, 251, 720

A capacitor for a memory Cell, such as DRAM, is fabricated on a supporting substrate by forming a high dielectric constant @LDC) capacitive dielectric film (1) on a bottom plate electrode comprising Pt, Pt-Al, Rh, Rh oxide, W, W nitride, Ti, Ti nitride, Cs oxide, or SrRh oxide; followed by densifying or conditioning the capacitive dielectric fiJm at ~ 1 atm. Increased capacitance per unit area due to the use of the HDC material is obtained. The leakage current of (1) is reduced, and the thermal budget is conserved.

Platinum-Manganese Based Target

hitachi metals ltd Japanese Appl. 2001 /089, 850

A Pt group metal-Mn alloy (1) for the manufacture of antiferromagnetic magnetic film in magnetic discs is formed by Solidifying rapidly quenched and sprayed particles of (1) obtained by gas atomisation, by hot isostatic pressing, etc. (1) has excellent fTJm forming characteristic, strength and uniform dispersion. Targets based on (1) combine high coercive force wifh reduced dispersion due to the uniform structure.

Magnetising Directional Control FiIm

fujitsu ltd Japanese Appl. 2001 /111, 136

Thin, magnetised-directional control film (1) has an antiferromagnetic layer formed on a foundation layer (2), made of a six-metal, alloy, one being chosen from the group of Ru, Ti and Zr. An antiferromagnetic layer formed above (2), consists of Fe-Mn, Ir-Mn, Pd-Mn, Pt-Mn, Pd-Pt-Mn and Ni-Mn. A magneto-resistance effect type sensor is also claimed. (1) is used in hard disks for controlling the direction of magnetisation of magnetic recording media.

Magnetic Head for Recording/Reproducing Apparatus

sony corp Japanese Appl. 2001 /134, 904

Magnetic heads comprise soft magnetic kminated films of kminated thin soft magnetic layers (1) and Pt, all, Ag or Pd layers, formed on a magnetic core. (1) consists of FejSibTacRudGaeNf (in at.%): 62 ≤ a < 75, 7 < b < 18, 3 < C. < 10, 0 = d < 10, 0 = e < 6, 5 < f < 12 and b + C. > 13. Heads, for recording/ reproducing apparatus, have high saturation magnetic flux density, excellent corrosion resistance and improved reproduction.

The New Patents abstracts have been prepared from material published by Derwent Information Limited.

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